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No. Libraries are not allowed on the DB server.
If you need libraries you're definitely doing something wrong.
It's usually a sign of putting stuff that belong somewhere else on the db server.
If you need excel interop the right place is a file server since you're most likely trying to create excel files.
Same goes for all others.

Mladen , it's part of an ETL managed via SSIS. I've recommended to the developer to manage the transformation aspect on a separate server. Extra libraries as a policy are not allowed on the production servers.
gbn, I like the idea of an SSIS dedicated server